Malicious PDF — malware analysis report

Static analysis result for SHA-256 0638531089eb24aa…

MALICIOUS

PDF

51.9 KB Created: 2020-03-30 02:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 17c5b9529cd547dfda4815bb23db0366 SHA-1: 54957788adf0eced1ba468ccf571fb97af9cd1c8 SHA-256: 0638531089eb24aa22ca742d141dfb0a57e0d79604baac4e69e773e59376f89e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body also contains a prominent URL, 'http://hall-elopement.rominastiebenphotography.com/uploads/1/3/0/6/130639315/130639315.html#macroeconomics+12th+edition+gordon+pdf', which suggests a lure to external content. While no scripts were explicitly extracted, the presence of numerous external links and the ML_NYX_PDF_MALICIOUS firing indicate a high likelihood of malicious intent, possibly to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hall-elopement.rominastiebenphotography.com/uploads/1/3/0/6/130639315/130639315.html#macroeconomics+12th+edition+gordon+pdf
    • http://myindependentkids.com/uploads/1/3/0/6/130604200/kulovonexadi_pusozapufesur_nokowo.pdf
    • http://tourlogs.com/uploads/1/3/0/6/130620587/22163.pdf
    • http://tbpoetry.com/uploads/1/3/0/8/130874059/37ef6bfa5.pdf
    • http://kingscountybehavioralhealth.com/uploads/1/3/1/3/131380466/jaxipaten-bevoruven-nivifivigesugot-mibitomubumog.pdf
    • http://riseupcounselingandcoaching.com/uploads/1/3/0/8/130813692/zanokuji.pdf
    • http://eriklankinmedia.com/uploads/1/3/0/2/130289201/modag.pdf
    • http://24h-story.de/uploads/1/3/0/6/130621708/456d085458c96.pdf
    • http://outrageusa.com/uploads/1/3/0/4/130476642/jugefoxuvup_pekebemipebo_jiwaxituxaz_wozafatoxapade.pdf
    • http://burnsserver.net/uploads/1/3/0/6/130639739/3193059.pdf
    • http://kevinformasoncounty.com/uploads/1/3/0/7/130776149/dc0953fc823a.pdf
    • http://bferris.net/uploads/1/3/0/6/130605238/kibewun.pdf
    • http://onewireless.org/uploads/1/3/0/4/130490928/6758004.pdf
    • http://haven94.com/uploads/1/3/0/5/130551390/lasixenesejobixetoj.pdf
    • http://abmultiservices.fr/uploads/1/3/0/5/130590431/xubok.pdf
    • http://morningtuneup.com/uploads/1/3/0/2/130288412/tazosibelivejulekep.pdf
    • http://brotwicecustodialservices.org/uploads/1/3/0/7/130775293/nufonowu.pdf
    • http://morganadvisory.org/uploads/1/3/0/6/130604036/kemejepokeb-gixedese.pdf
    • http://exchangeclubmobile.org/uploads/1/3/0/6/130604492/9909088.pdf
    • http://auroaustria.com/uploads/1/3/1/1/131163962/09bcdf2d5afa34.pdf
    • http://eagletaxflorence.com/uploads/1/3/0/4/130436272/muxebu_kovufabezizev_merafulijagib_xukuloniv.pdf
    • http://jkehair.com/uploads/1/3/0/6/130603983/5402699.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008da1.bin
79629b0f491738e4281fe8b0b3f5ff43b919ab1e93648fd603d5bcf9afa4f905		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA1 8040 bytes
font_01_sfnt_off0000acc8.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACC8 16036 bytes

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